Effective ways to prevent diabetes include learning about diabetes, exercising appropriately, eating a healthy diet, losing weight, and getting regular diabetes screenings. Healthy people need to know something about diabetes, such as the definition of diabetes, signs and symptoms, common risk factors, and complications, to help prevent the occurrence of diabetes in themselves and their family members around them. For people who are overweight or even obese, they need to actively reduce their weight so that their body mass index can be maintained between normal levels (18.6 to 23.9 kg per square meter) for a long period of time, which helps to maintain normal pancreatic islet function. Plainly focusing on proper exercise and healthy diet can not only keep the blood glucose level normal, but also help to control blood pressure, blood lipid level as well as body weight to prevent the occurrence of diabetes. For people at high risk of diabetes, such as those who are obese, pregnant, have a family history of diabetes, and the elderly, it is necessary to go to the hospital regularly for diabetes screening such as blood glucose tests and glucose tolerance tests, so that diabetes can be diagnosed at an early stage and treated appropriately according to the doctor’s instructions.